///////////////////////////////////////////////////////////////////////////
//
//		Realistic rain real-time simulation program
//
//		Pierre Rousseau
//
///////////////////////////////////////////////////////////////////////////
//
//		Global definitions
//
///////////////////////////////////////////////////////////////////////////



#ifndef __COMMON_RAIN__
#define __COMMON_RAIN__


////////////////////////////////////////////////////////////
/// determine what the program will look like
////////////////////////////////////////////////////////////

// currently incompatible with STREAKS or LIGHT_EXTENSION :
//#define SNOW

#ifndef SNOW
#define STREAKS

//#define LIGHT_EXTENSION
#endif






////////////////////////////////////////////////////////////
/// this constant defines the size (in pixels) of the
/// position texture. 
/// There will be (BILLBOARD_POS_TEX_SIZE) ²
/// particles in the system.
////////////////////////////////////////////////////////////
#define BILLBOARD_POS_TEX_SIZE 	64






////////////////////////////////////////////////////////////
/// Constants for the program
////////////////////////////////////////////////////////////
// size of the "render to texture" : if using frame buffer copy, must be less than the frame buffer size
#define RTTSIZE 512

#define _PI 3.1415926535
#define FOVyCam (_PI/3.0)
#define FOVyRtt (15.0 * _PI / 18.0)

// arbitrary unit = 0.1m
#define HAUTEUR_OBSERVATEUR 18.0



////////////////////////////////////////////////////////////
/// Values for the hardware implementation
/// of the particle system
////////////////////////////////////////////////////////////


#define PARTICLE_POSITION_TEXTURE_NAME		"floating_point_RTT_ping"
#define PARTICLE_POSITION_BACKUP_TEXTURE_NAME	"floating_point_RTT_pong"
#define PARTICLE_POSITION_INIT_TEXTURE_NAME	"floating_point_initializer"

#define STATIC_GEOMETRY_NAME	"billboards_in_vertex_buffer"


#define LIGHT_INFO_TEXTURE_NAME		"light_information_texture"

#define BILLBOARD_MESH_NAME		"cloned_manual_mesh"

#define RAIN_MATERIAL_NAME		"rain_system_material"

#define REFRACT_RTT_NAME		"refract_rtt"


#define PARTICLES_MIN_X		-2000
#define PARTICLES_MAX_X		 2000
#define PARTICLES_MIN_Y		  -10
#define PARTICLES_MAX_Y		  100
#define PARTICLES_MIN_Z		-2000
#define PARTICLES_MAX_Z		 2000



#define VIS_PARTICLE_BOX_MIN_X		-50
#define VIS_PARTICLE_BOX_MAX_X		 50
#define VIS_PARTICLE_BOX_MIN_Y		-20
#define VIS_PARTICLE_BOX_MAX_Y		 80
#define VIS_PARTICLE_BOX_MIN_Z		-50
#define VIS_PARTICLE_BOX_MAX_Z		 50


#endif // __COMMON_RAIN__